Indicator.



PATENTED JUNE 2, 1908.

I D. LEVY. INDICATOR.

APPLICATION FILED APILll, 1907.

IN VEN TOR.

1 WITNESSES:

consists in the indicator havin UNITED STATES PATENT OFFICE.

D'AVEGA LEVY, or NEW navEmooN Eo'rIoUr. A i I Specification of Letters Patent.

Patented Tune 2, recs.

- Application filed April 11, 1907: 861181 No. 367,538.

a tool that will be sufficiently sensitive to indicate the slightest variation from the true of the workbeing tested, as well as to accomplish this result with few parts of simple-and economical desi n. w

To these, an other ends, my invention certain details of construction and .com inations of parts as will be hereinafter described and more particularly pointed out in the-claims.

Referring to the drawings, in which-like numerals ofreference designatelike parts in the several figures Figure 1 is a plan-view of my device complete; 'I'i 2 is a s1de eleva tion thereof; Fig. 3 is a p an View Withthe .s

t e intermediate position of the pressure fine'r10, contact bali15 and fin er'13-by full top plate and connected parts removed. Fig. 4'is a longitudinal, sectional-elevation upon 4-4 of Fig. 3; Fig. 5 is a fra mentary v ew of a portion of the base mem er showing the spring in one of its ositions; Fig. 6 is a fragmentary view of t e underside of the said base member; and Fig. 7 is a plan view of the spring stud. Y

In the practice of my invention, I rovide a base member 1 which is points at its forward end 2 and terminating in a 'raduated are 3 at the other end. On eac side of the said base member are the upwardly projecting flanges 4 to which the top plate 5 1s secured by screws or other convenient means.

Passing through the top plate 5 is the stud 9 having a head 8 to which are fixed the companion springs 77" and carrying the pressure finger 10 which is held thereon .by

' the nut 11. The sprin s 7'7 are formed Pivotally mounted in the stud 9 and screw 12, threaded through the base member 1, is a finger 13 which projects over the base mem-- her and terminates near the end 3 thereof.

I The numeral 14 designates a lever which on s in the to plate 5 and the base member 1. A 'remova le contact ball 15 is upon the outer end ofsaid lever and the inner end is formed in the sha e circles the hub of with the sides thereof slightly in advance of its pivot mounting. The screw 17 which passes through the hub 18 upon thebase 1s, ivotally mounted midway between its 7 of a yoke 16 that en e finger 13 and contacts member 1 provides ready means foradjusting the frictional contact of the pivot bear ing of said lever.

I'h ave illustrated the contact memberherein as a ball (15), but any other form, that may be deemed desirable, can be used equally as well, or the said member may be removed entirely and onl the pointed end of the'lever 14 used. Fixe in saidlever 14 is apintle 19 which projects upwardly therefrom into the open space between the free ends of the springs 7 7 The zero position of the contact ball 15 andfinger l-3is variable, to accommodate different classes of work, b

manipulating the pressure finger 10, which it will be recalled is rigidly connected with the rings 77'. In Fig. 1 I have illustrated ines and the extreme positions by the broken lines which are severally designated by the figures 13, 13 and 15, 15". In Fig. 5 s rings 7-7 are illustrated by full lines 111 t e extreme position C, the intermediate 0- sition' by the brolen lines A, and the ot er extreme position by the broken lines B. The

contact ball 15 and finger 13 are always re-.

turned to-their zero 'positions'by the action of either one or the other of thesprings 7 or 7 engaging with the intle 19, the actin spring being determined y the direction 0 move ment of the contact ball 15.

To illustrate the, application of my invenQ tion in testing the trueness of rotary arts'I will describe the operation of truing o a hole in a part fixed upon a lathe.

ing e hole therein is temporaril secured to the face plate and the indicator eldsothat' the ball 15 contacts with the surface of said The part havhole, in "which position the springs 77 hold-"--' the finger 3 at the central zero graduation.

Now, as the face plate is rota-ted theengagementof said ball with said hole surface will move the lever 14 upon its pivot mounting when the hole is not true, which lever moves the finger 13 in a circular path over the gradnations upon the base member, and the fact that-thehole is out of true is indicated thereby. v The springs 7 always return the parts to their normal central position as soon as the pressure is removed from the contact ball; The finger 13 is so long and the point of contact of the lever 14 with said finger is so close to its pivot mounting that the movement of ball and socket connection t eindicator can be moved into practically any desired position.

The use of my invention is not limited to testing rotary parts, but may be fastened in a 1pllaner for illustration, and moved over a part xed upon the bed thereof to determine whether the same is true or not. uses might also be suggested, but the above will suffice to illustrate the practical operation of my device.

In some cases it is desirable that the finger 13 should not indicate zero as the center of the graduation, as above described, but located at either end of said graduations, and

the position of the finger 13 is shifted to accommodate such cases by moving the position of the springs 7 & 7 which, by their enga ement with the intle 19 in the lever 14, ho (1 said lever and germ the desired posi- Many other tion. The springs 7 8c 7 are shifted by moving the pressure finger 10 about the stud 9, and the extreme positions of said springs 7 &

7" are shown by the full and broken lines in N Fig. 5. i

There are minor changes and alterations that can be made Within my invention, aside from those herein suggested, and I would therefore have it understood that I do not limit myself to the exact construction herein shown and described, but claim all-that falls fairly within the .spirit' and scope of my invention. i

Having described my invention, what I claim as new, and desire to secure by Letters.

Patent, is v 1. In an indicator, the combination with a base member; of a pivotally mounted finger; a pivotally mounted lever-engaging said finger between its pivot mounting and the free end thereof; means for varyingthe frictional enga ement of both pivot mountings; and

rotarlly adjustable spring mechanisms for varying the zero position of said finger and Iever. i

2. In an indicator, the combination with the base member 1 of the finger 13 and lever 14 having pivot bearin 5; screws 12 and 17. for adjusting said pivot earings; companion springs 7 and 7 engaging'a fixed part on said lever; and a pressure finger 10. for shifting the position-o said sprin s.

In testimony whereof affix my signature in presence of two witnesses.

DAVEGA LEVY. Witnesses: I I

I GEORGE E. HALL,

FLORENCE H. MONK. 

